TRANSMISSION SYSTEMS

摘要

An apparatus for transmitting power from an engine to an electrical machine, the apparatus comprising a first shaft (10), a second shaft (1) and a multi-speed transmission device, the first and second shafts being coupled to the transmission device, the transmission device being operable to provide a first ratio of relative rotational speed between the first shaft and the second shaft when the first shaft is driven by the second shaft and a second ratio of relative rotational speed between the first shaft and the second shaft when the second shaft is driven by the first shaft, the first shaft comprising coupling means for rigidly coupling it to an engine crankshaft (10), wherein the transmission device is operable to decouple the second shaft from the first shaft, thereby to allow independent rotation thereof.